Spectacle lens for a display device which can be placed on the head of a user and generates an image

ABSTRACT

A spectacle lens for a display device which can be placed on the head of a user and generate an image has a front and a rear, an injection section and a deflection section spaced from the injection section, an exit section in the rear and a light-guiding channel which guides light beams of pixels of the generated image, which are injected into the spectacle lens via the injection section, in the spectacle lens to the deflection section, by which they are deflected towards the exit section and then coupled out of the spectacle lens through the exit section. The spectacle lens is in the form of a progressive lens having a distance vision region and a near vision region, and the exit section, as viewed from above onto the rear of the spectacle lens, lies outside the distance vision region and outside the near vision region.

PRIORITY

This application claims the benefit of German Patent Application No.102017101352.0 filed on Jan. 25, 2017, which is hereby incorporatedherein by reference in its entirety.

FIELD

The present invention relates to a spectacle lens for a display devicewhich can be placed on the head of a user and generates an image, to adisplay device having such a spectacle lens and to a method forproducing such a spectacle lens.

BACKGROUND

Such spectacle lenses comprise a front side, a rear side, an inputsection, a deviating section separated from the input section, an exitsection in the rear side, and a light guide channel which guides lightbeams from pixels of the generated image, which are input into thespectacle lens through the input section of the spectacle lens, in thespectacle lens as far as the deviating section, by which they aredeviated in the direction of the exit section and are then output fromthe spectacle lens through the exit section.

Such a spectacle lens may be part of imaging optics of a display devicewhich can be placed on the head of a user and generates an image, theimaging optics imaging the generated image in the worn state of thedisplay device in such a way that the user can perceive it as a virtualimage. The spectacle lens therefore contributes to the desiredfunctionality of the overlay of the generated image into the field ofview of the user.

SUMMARY

An object of the invention to refine a spectacle lens in such a way thatit essentially provides the function of the image overlay for as manydifferent users as possible.

Furthermore, a display device having such a spectacle lens, as well as aproduction method for such a spectacle lens, are intended to beprovided.

By the configuration of the spectacle lens as a progressive power lensand the arrangement of the exit section outside the far-field region andoutside the near-field region (as seen in a plan view of the rear sideof the spectacle lens), the spectacle lens may be provided for users whorequire a progressive power lens. Since the exit section is arrangedoutside the far-field region and outside the near-field region, theregion of the progressive power lens is in this case advantageously usedwhich, during normal use of the progressive power lens, systematically(according to the so-called Minkwitz Theorem) has such high aberrationsthat these regions of the progressive power lens are not used, or areused only little, by the user when looking through the progressive powerlens.

In the progressive power lens, the curvature (or the curvature profile)of the exit section may differ from the curvature (or the curvatureprofile) of an intermediate region of the rear side between the exitsection and the near-field region in such a way that the ametropiacorrection when viewing the environment through the exit section isinferior than when viewing the environment through the intermediateregion.

The transition from the exit section to the surrounding region of therear side may be configured as a continuous and differentiable surfacesection. In particular, the entire rear side may be configured as acontinuous and differentiable surface.

Furthermore, in the spectacle lens, the front side may be configured tobe curved and the rear side may be configured to be curved.

The guiding of the light beams in the spectacle lens from the inputsection to the deviating section may be carried out by reflections (forexample total internal reflections).

In the spectacle lens, the rear side may be configured as a freeformsurface which carries out the desired ametropia correction.

Furthermore, the exit section may be spherically or aspherically curved.In particular, the exit section may be configured as a freeform surface.

The front side of the spectacle lens may be spherically curved.

The spectacle lens may also be configured in such a way that the frontside is configured as a freeform surface for the ametropia correctionand the rear side is spherically curved. The advantage achieved by thisconfiguration is that the output of the light beams takes place throughthe rear side, and in particular through the exit section in the rearside, independently of the effect of the progressive power lens, sincethe ametropia correction is carried out by the front side configured asa freeform surface. Furthermore, it is possible to configure both thefront side and the rear side respectively as a freeform surface, whichtogether carry out the desired ametropia correction.

In the spectacle lens, the astigmatism in the exit section may be atleast 1 diopter, and in particular at least 2 diopters.

Furthermore, in the spectacle lens, the astigmatism in the near-fieldregion may be not more than 1 diopter, and in particular not more than0.5 diopters.

In the spectacle lens, the far-field region and the near-field region,as seen in a plan view of the rear side of the spectacle lens, maytogether be configured in a T-shape. In particular, the far-field regionmay lie above the near-field region. The exit section may be arranged onthe right or left next to the near-field region.

The spectacle lens may be configured as a single-sheet, double-sheet ormultisheet spectacle lens. In order to guide the light beams in thespectacle lens, reflections may take place on the front and/or rearside. It is, however, also possible for one or more reflective orsemireflective layers to be provided on the front and/or rear side orinside the spectacle lens in order to guide the light beams.

The deviating section may comprise a reflective or semireflectivedeviating surface. It is furthermore possible that the deviating sectionmay comprise a plurality of reflective or semireflective deviatingsurfaces arranged next to one another. The deviating section may beconfigured in such a way that it carries out pure beam deflection. Itis, however, also possible for the deviating section additionally tohave an imaging property. This may be achieved by a correspondingarrangement of the deviating surfaces (which may also be referred to asfacets). In addition or as an alternative, it may be achieved by acurvature profile of the deviating surfaces or of the single deviatingsurface.

The reflective or semireflective facets may be arranged offset withrespect to one another in the manner of a zigzag line or a sawtoothline.

The deviating surface or the deviating surfaces preferably do not extendover the entire thickness (extent from the front side to the rear side)of the spectacle lens, but only over a part thereof. In particular, thedeviating surface/deviating surfaces may be configured as a burieddeviating surface/deviating surfaces, which extend precisely as far asthe front side or not as far as the front side. The depressions possiblyexisting because of the deviating surfaces may be configured in such away that there is a continuous front side.

Furthermore provided is a display device having a holding device whichcan be placed on the head of a user, an image generation module, whichis fastened on the holding device, and imaging optics which are fastenedon the holding device and which comprise a spectacle lens according tothe disclosureand image the generated image in the state of the holdingdevice placed on the head of the user, so that the user can perceive itas a virtual image.

The imaging optics may comprise the spectacle lens as the only opticalelement. It is, however, also possible for the imaging optics to alsocomprise at least one further optical element besides the spectaclelens. The at least one further optical element may be separated from thespectacle lens or connected thereto. It is furthermore possible for theat least one further optical element to be configured in one piece withthe spectacle lens.

The display device may comprise a control unit which controls the imagegeneration module.

The image generation module may in particular comprise a flat imagegenerator, such as for example an LCD module, an LCoS module, an OLEDmodule or an adjustable-mirror matrix. The image generator may comprisea multiplicity of pixels, which may for example be arranged in rows andcolumns. The image generator may be self-illuminating or notself-illuminating.

The image generation module may, in particular, be configured in such away that it generates a monochromatic or a polychromatic image.

The display device may comprise further elements, known to the personskilled in the art, which are required for the operation of the displaydevice.

Furthermore provided is a method for producing a spectacle lens, whereindifferent ametropia ranges, which are respectively determined by a rangeof the aberrations to be corrected, are established, for each ametropiarange, a curvature profile of the exit section is calculated and thisexit section is assigned to the ametropia range, the ametropia range inwhich the aberration value of the spectacle lens to be produced lies isdetermined, the curvature profile of the rear side of the spectacle lensto be produced is calculated in such a way that the exit sectionassigned to the ametropia range determined is selected and its curvatureprofile is kept constant and not changed during the calculation of thecurvature profile of the rear side, and the spectacle lens is producedon the basis of the calculated curvature profile of the rear side.

The aberration to be corrected may, for example, be the sphericalaberration. The ametropia ranges may then, for example, extend over ±2diopters, ±1 diopter or ±0.5 diopters. It is therefore possible, forexample, to subdivide ametropias from the range of −10 to +10 dioptersinto 5, 10 or 20 ametropia ranges, and for each of these ametropiaranges to calculate precisely one curvature profile for the exit sectionand to assign this to the ametropia range. It is therefore necessary tocalculate only 5, 10 or 20 curvature profiles for the exit section. Thismay be carried out once, and then the calculated curvature profiles maybe used for the exit section for the individual configuration of aspectacle lens. This significantly facilitates the production of aprogressive power lens for a user. It has been found that outstandingimaging properties for the representation of the virtual image may beachieved with this procedure.

The aberration to be corrected may be a single aberration (such as forexample the spherical aberration) or also a plurality of differentaberrations.

The method for producing a spectacle lens may be refined in such a waythat the spectacle lens (including its refinements) can be produced.

It is to be understood that the features mentioned above and those yetto be explained below may be used not only in the combinations specifiedbut also in other combinations or individually, without departing fromthe scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in yet more detail below by way ofexample with the aid of the appended drawings, which also disclosefeatures essential to the invention.

FIG. 1 shows a schematic perspective representation of one embodiment ofthe display device according to the invention;

FIG. 2 shows an enlarged partial sectional view of the first spectaclelens, including a schematic representation of the image generationmodule;

FIG. 3 shows a schematic sectional view of the first spectacle lens;

FIG. 4 shows a plan view of the rear side 15 of the first spectaclelens;

FIG. 5 shows a plan view of the rear side of a further embodiment of thefirst spectacle lens with contour lines for the spherical aberration;

FIG. 6 shows a plan view of the rear side of the first spectacle lens 3according to FIG. 5 with astigmatism contour lines;

FIG. 7 shows a plan view of the rear side of a conventional firstspectacle lens in the same way as in FIG. 5;

FIG. 8 shows a plan view of the rear side of a conventional spectaclelens in the same way as in FIG. 6;

FIGS. 9 to 11 show enlarged partial sectional views of furtherembodiments of a first spectacle lens according to the invention,including a schematic representation of the image generation module;

FIG. 12 shows a perspective exploded representation of an in a furtherembodiment of the first spectacle lens according to the invention;

FIG. 13 shows a perspective representation of the first spectacle lensaccording to the invention according to FIG. 12, and

FIG. 14 shows an enlarged partial sectional view of a further embodimentof the first spectacle lens according to the invention, including aschematic representation of the image generation module.

While the invention is amenable to various modifications and alternativeforms, specifics thereof have been shown by way of example in thedrawings and will be described in detail. It should be understood,however, that the intention is not to limit the invention to theparticular example embodiments described. On the contrary, the inventionis to cover all modifications, equivalents, and alternatives fallingwithin the scope of the invention as defined by the appended claims.

DETAILED DESCRIPTION

In the following descriptions, the present invention will be explainedwith reference to various exemplary embodiments. Nevertheless, theseembodiments are not intended to limit the present invention to anyspecific example, environment, application, or particular implementationdescribed herein. Therefore, descriptions of these example embodimentsare only provided for purpose of illustration rather than to limit thepresent invention.

In the example embodiment shown in FIG. 1, the display device 1comprises a holding device 2, which can be placed on the head of a userand which may for example be configured in the manner of a conventionalspectacle frame, as well as a first and a second spectacle lens 3, 4,which are fastened on the holding device 2. The holding device 2 withthe spectacle lenses 3 and 4 is configured as a progressive power lensfor the correction of an ametropia, wherein the user may have a virtualimage overlaid into his or her field of view through the first spectaclelens 3, as will be described below.

To this end, the display device 1 comprises an image generation module5, which may be arranged in the region of the right spectacle frame arm2, as is schematically illustrated in FIG. 1. The image generationmodule 5 may comprise a flat image generation element 6 (FIG. 2), suchas for example an OLED, a CMOS or an LCoS chip, or an adjustable-mirrormatrix, having a multiplicity of pixels arranged in columns and rows forexample.

The spectacle lenses 3 and 4, and in particular the first spectacle lens3, are described only by way of example together with the display device1 according to the invention. The spectacle lenses 3, 4, or at least thefirst spectacle lens 3, are respectively configured per se as aspectacle lens 3, 4 according to the invention.

As can be seen best from the enlarged schematic partial sectional viewin FIG. 2, the display device 1 comprises imaging optics 7, whichcontain an optical element 8 arranged between the image generationelement 6, or the image generator 6, and the first spectacle lens 3.Furthermore, the first spectacle lens 3 itself is also used as part ofthe imaging optics 7.

A light beam 9 may originate from each pixel of the image generator 6.By corresponding control of the pixels of the image generator 6 by meansof a control unit 10, which may be part of the image generation module5, the desired image may be generated. In FIG. 2, to represent the lightbeams 9, the ray path of a light ray is indicated, so that thediscussion below also relates to the light ray 9.

The light ray 9 originating from the image generator 6 passes throughthe optical element 8 and, through an input section 11 (in this case theend side of the first spectacle lens 3), enters the first spectacle lens3 and is guided in the latter along a light guide channel 12 as far as adeviating section 13. The deviating section 13 in this case comprises aplurality of semireflective deviating surfaces 14 (which may also bereferred to as semireflective facets) arranged next to one another, atwhich reflection of the light rays 9 in the direction of a rear side 15of the first spectacle lens 3 takes place, so that the light rays 9emerge from the first spectacle lens 3 through an exit section 16 of therear side 15. A user, when he or she is correctly wearing the displaydevice 1 according to the invention, can therefore perceive the imagegenerated by means of the image generator 6 as a virtual image when heor she looks at the deviating section 13. In FIG. 2, the rotation point17 of the user's eye as well as the eyebox 18 or the exit pupil 18 ofthe imaging optics 7 are indicated for illustration. The eyebox 18 isthe region in which the user's eye can move and he or she can stillperceive the generated image as a virtual image.

Although, in the exemplary embodiment described, the input is carriedout into the end side of the first spectacle lens 3 and the inputsection 11 is therefore formed on the end side of the first spectaclelens, it is also possible to carry out input through the rear side 15 ofthe first spectacle lens 3.

As is shown in the schematic representation of FIG. 2, the rear side 15and a front side 19 of the first spectacle lens 3 are respectivelyconfigured to be curved. The first spectacle lens 3 is furthermoreconfigured in two sheets, and comprises an outer sheet 20 as well as aninner sheet 21. The side of the outer sheet 20 facing away from theinner sheet 21 forms the curved front side 19 of the first spectaclelens 3, and the side of the inner sheet 21 facing away from the outersheet 20 forms the rear side 15 of the first spectacle lens 3.

In order to form the light guide channel 12, a first reflection surface22 is formed between the outer and inner sheets 20, 21, which surfaceextends from the input section 11 as far as the deviating section 13.Furthermore, a second reflection surface 23, which lies opposite thefirst reflection surface 22 and in turn extends from the input section11 as far as the deviating section 13, may be formed on the front side19. The two reflection surfaces 22 and 23 are preferably configured tobe semireflective. The light beams input through the input section 11can therefore be guided in the light guide channel 12 by reflections onthe reflection surfaces 22 and 23 from the input section 11 as far asthe deviating section 13. The second reflection surface 23 may also beomitted. In this case, total internal reflection of the light beams 9preferably takes place on the front side 19 in the region of the lightguide channel 12, in order to ensure the desired guiding of the lightbeams in the light guide channel 12.

FIG. 3 shows a schematic sectional view of the z-x plane of the firstspectacle lens 3, which is configured as a progressive power lens. Thefront side 19 is in this case spherically curved, and the rear side 15has an aspherical curvature with an increasing curvature in the xdirection (and therefore with decreasing radii of curvature r1, r2, r3,r4, r5 in the x direction), so that the upper region is corrected forfar-field vision and the lower region is corrected for near-fieldvision. For illustration, the curvature profile with a constant radiusof curvature r1 is indicated by dashed lines, which is denoted by thereference number 15′.

The radius of curvature r1 therefore denotes the curvature for far-fieldvision. The radius of curvature r5 denotes the radius of curvature fornear-field vision, and the radii of curvature r2-r4 are the radii ofcurvature in the transition region between far-field vision andnear-field vision. The first spectacle lens therefore has a smooth (i.e.stepless) diopter number transition between the (upper) far-field partand the (lower) near-field part. The required greater curvature of thefirst spectacle lens 3 in the lower region leads to astigmatic errors inthe transition zone in the lateral field of view. This effect is oftenalso referred to as the Minkwitz Theorem.

This astigmatic error is represented schematically in the schematic planview of the rear side 15 in FIG. 4 in the form of contour lines forequal astigmatic error. The lines L1, L2, L3, L4 and L5 in this casecorrespond to an astigmatic error of 0, 1, 2, 3 and 4 diopters,respectively. For example, the astigmatic error for the line L3 istherefore 2 diopters. The astigmatic error is in this case intended tomean the magnitude of the difference of the refractive power in the ydirection and the refractive power in the x direction.

The progressive power lens 3 therefore comprises an upper far-fieldregion F for far-field vision and a lower near-field region N fornear-field vision, the near-field region N having a much smaller extentin the y direction than the far-field region F because of theunavoidable astigmatic error in the lateral field of view (MinkwitzTheorem). The far-field region F and the near-field region N thereforetogether form a T-shape in a plan view of the rear side 15.

The first spectacle lens 3 is now configured in such a way that the exitsection 16 (as seen in the representation of FIG. 4) lies at the lowerright, so that a user, when the display device is worn, must look downto the right relative to the straight-ahead view G (FIG. 2) in order tobe able to perceive the generated image as a virtual image. So that theimage representation can be generated as far as possible withoutastigmatic errors (which occur precisely in this region of theprogressive power lens 3 on the aspherical rear side 15), the curvatureprofile of the rear side 15 in the exit section 16 is other than ordifferent to the curvature profile of the environment of the rear side15 immediately adjacent to the exit section 16. In particular, theentire imaging optics 7, and therefore also the curvature of the exitsection 16, are configured in such a way that maximally distortion-freeimaging takes place. This may, for example, have the effect that thereis inferior ametropia correction when viewing the environment throughthe exit section 16, when no image is generated and imaged as a virtualimage, in comparison with the case in which there is no specialadaptation of the curvature of the exit section 16. It may also bestated that the ametropia correction when viewing the environment isinferior than when viewing the environment through a section 24 whichlies between the exit section 16 and the near-field region N.

The rear side of one embodiment of the progressive power lens 3according to the invention is shown in a plan view in FIG. 5, therefractive power (spherical effect) being represented in diopters bycontour lines. The dimensions in the x and y directions are specified inmillimeters. The progressive power lens is configured for a user whorequires no correction for far-field vision and a correction of +2diopters for near-field vision. A plan view of the rear side 15 of thespectacle lens of FIG. 5 is shown in FIG. 6 in the same way as in FIG.5, contour lines for the astigmatism of the progressive power lens 3being indicated in FIG. 6. As can be seen from the representations inFIGS. 5 and 6, the exit section 16 lies outside the far-field region Fand outside the near-field region N in the lower lateral (in this caseright) field of view. In this region, there is a low refractive power(here a range of 0.75 diopters) and a large astigmatism (here in therange of 2). However, the curvature profile of the exit section 16 isconfigured in such a way that good and therefore maximally error-freeperception of the generated image as a virtual image is possible.

A conventional progressive power lens 3′ is shown in FIGS. 7 and 8 inthe same way as in FIGS. 5 and 6. Thus, the refractive power (sphericaleffect) in diopters is shown in a plan view of the rear side 15″ in FIG.7 and the astigmatism is shown in FIG. 8, for a spectacle lens which isintended to have no correction in the far-field region F and acorrection of +2 diopters in the near-field region N. As a comparison ofFIGS. 7 and 8 with FIGS. 5 and 6 shows, in the conventional spectaclelens 3′ there is a lower astigmatism in the lower right field of viewthan in the comparable region (exit section 16) of the spectacle lens 3according to the invention according to FIG. 6. This shows that thespectacle lens 3 according to the invention has inferior properties forlooking through in the right lower field of view than a conventionalprogressive power lens 3′ for the same user with the same parameters(thus in this case a far-field region F without ametropia correction anda near-field region N with an ametropia correction of +2 diopters). Yetsince this lower right field of view region is systematically not usablefor the use, this quality reduction when looking through is not adisadvantage. On the contrary, advantageously this actually unusedregion of the progressive power lens 3 is now advantageously used forthe generation of the desired virtual image.

The curvature of the exit section 16 may, for example, be spherical oraspherical. Preferably, the transition between the exit section 16 andthe immediately adjacent region of the rear side 15 (for example section24) is configured in such a way that it is continuous anddifferentiable. In particular, preferably the entire rear side 15 isconfigured as a continuous and differentiable surface.

In the exemplary embodiment described here, the inner sheet 21, or thecurvature profile of the rear side 15, is used as a correction surfacewhich provides the desired progressive power functionality.

The first spectacle lens 3 may also be configured in three sheets, as isschematically represented in FIG. 9. The representation of FIG. 9corresponds to that of FIG. 2, and elements which are the same aredenoted by the same references. As is shown in FIG. 9, arranged on theouter sheet 20 there is a second outer sheet 25, which is connected (forexample adhesively bonded) to the outer sheet 20. The side of the secondouter sheet 25 facing away from the inner sheet 21 forms the front side.

In the embodiment described here, the outer sheet 20, which in thethree-sheet structure may also be referred to as a channel sheet 24, isthicker in the region of the light guide channel 12 than in theremaining region. Naturally, the channel sheet 20 may also be configuredwith a constant thickness. Furthermore, the channel sheet 20 extendsover the entire first spectacle lens 3 and may therefore also bereferred to as spacer sheet 20, since it always lies between the innersheet 21 and the second outer sheet 25, so that the second outer sheet25 is never in direct contact with the inner sheet 21.

It is, however, also possible that the channel sheet 20 does not extendover the entire first spectacle lens 3. In particular, the channel sheet20 may extend only in the region of the light guide channel 12. In thiscase, in the other regions in which the channel sheet 20 is not present,there may be direct contact between the inner sheet 21 and the secondouter sheet 25, as is schematically represented in FIG. 10.

A further embodiment, in which the light guide channel 12 in the firstspectacle lens 3 is formed by a plane-parallel channel plate 26, isshown in FIG. 11. The reflections for light guiding of the light rays 9then take place on the two side surfaces 27 and 28 of the channel plate26. This may be achieved by a corresponding reflection layer on the sidesurfaces 27, 28. It is furthermore possible to arrange the channel plate26 in the spectacle lens 3 in such a way that there is a small air gapbetween the side surfaces 27 and 28 and the rest of the spectacle lens3, so that light guiding by total internal reflection on the sidesurfaces 27 and 28 is provided. The spectacle lens 3 may in this case beconfigured with a single sheet, or also at least two sheets, as isindicated by the dashed line 29.

A further embodiment of the spectacle lens 3 according to the inventionare shown in FIGS. 12 and 13, FIG. 12 being a perspective explodedrepresentation and FIG. 13 being a perspective representation. As can beseen from FIGS. 12 and 13, there is a two-sheet configuration of thespectacle lens 3, the mutually facing sides 30 and 31 of the outer andinner sheets 20, 21 having complementary curvatures, so that they can beconnected flatly to one another.

The light guide channel 12 is essentially formed on the inner side 30 ofthe outer sheet 20. In this case, the light guiding may, for example,take place by total internal reflection on the interfaces 32, 33 of thelight guide channel 12 which lie opposite one another in the zdirection. Naturally, it is also possible for a reflective coating,which carries out the desired reflection of the light rays 9, to beformed on the interface 32 and/or on the interface 26. The reflectivityof the relative coating may, for example, be as high as possible (about100%) or less. The reflective coating may therefore be configured as amirror layer or as a semireflective layer.

In the embodiment described here, the interface 32 is part of the frontside 19 of the outer sheet 20. The interface 33 is not, however, part ofthe side 30 of the outer sheet 20 facing toward the inner sheet 21 but aseparately formed interface which, besides the light guiding, may alsoprovide an optically imaging property, for example in order to reduceimaging errors. The light guide channel 12 therefore protrudes relativeto the side 30 of the outer sheet 20, and therefore has a greaterthickness than the outer sheet 20 in the z direction.

In order nevertheless to be able to provide a first spectacle lens 3which is thin overall, the inner sheet 21 comprises a recess 34 whichextends from the side 31 of the inner sheet 21 in the direction of therear side 15. In the exemplary embodiment described here, the recessextends over the entire thickness (extent in the z direction) of theinner sheet 21. The recess 34 is dimensioned in such a way that, in theassembled state, the light guide channel 12 is seated in it and thedeviating section 13 lies next to the recess 34, and therefore in frontof the side 31 of the inner sheet 21. The exit section 16 therefore liesdirectly next to the recess 34, as is indicated in FIG. 12.

The further embodiment of the display device 1 according to theinvention shown in FIG. 14 differs from the embodiment according to FIG.2 in that the spectacle lens 3 is configured as a single-sheet spectaclelens 3, only the outer sheet 20 being provided. Since elements which arethe same are denoted by the same reference numbers, reference may bemade to the embodiments above for their description. The firstreflection surface 22 and/or the second reflection surface 23 may alsobe omitted. In this case, the required reflection for guiding the lightradiation 9 is achieved by total internal reflection.

In the display device 1 according to the invention, the overlay of thevirtual image into the field of view of the user takes place through thefirst spectacle lens 3. Naturally, an overlay through the secondspectacle lens 4 is also possible. Furthermore, the display device 1 maybe configured in such a way that the virtual image is overlaid throughboth spectacle lenses 3, 4. In this case, the overlay may be carried outin such a way that a three-dimensional image impression is formed. This,however, is not absolutely necessary.

The holding device 2 need not be configured as a spectacle-like holdingdevice 2. Any other type of holding device 2, with which placement andwearing of the display device 1 on the head may be carried out, is alsopossible.

Since different ametropias occur in practice, the curvature of the rearside 15 may, for example, be individually adapted in such a way thatametropias from the range of −10 to +10 diopters can be corrected. Sincethe imaging optics 7 of the data channel also need to be adapted to theindividual ametropia, the curvature of the exit section 16 would alsoneed to be adapted for each ametropia. An individual data channel(imaging optics 7) would therefore be configured for each ametropia.This, however, would be a very high outlay. Advantageously, therefore,the data channel may be configured for a predetermined ametropia range.For example, the diopter range of −10 diopters to +10 diopters may thusbe subdivided into 5, 10 or 20 ranges, which then respectively cover anextent of ±2 diopters, ±1 diopter or ±0.5 diopters. Therefore, 5, 10 or20 individually configured and already precalculated data channels areprovided, for which all the dimensions and curvatures are alreadyspecified. The curvature of the exit section 16 is also alreadyspecified. During the configuration of the curvature of the inner side15 in the remaining region, the curvature of the exit section 16 is thenkept constant and not changed. An individually adapted progressive powerlens 3, which furthermore also provides an outstanding imaging propertyfor the represented virtual image, or for the data overlay, maytherefore be produced in a straightforward way.

While the invention has been described in connection with what ispresently considered to be the most practical and preferred embodiments,it will be apparent to those of ordinary skill in the art that theinvention is not to be limited to the disclosed embodiments. It will bereadily apparent to those of ordinary skill in the art that manymodifications and equivalent arrangements can be made thereof withoutdeparting from the spirit and scope of the present disclosure, suchscope to be accorded the broadest interpretation of the appended claimsso as to encompass all equivalent structures and products. Moreover,features or aspects of various example embodiments may be mixed andmatched (even if such combination is not explicitly described herein)without departing from the scope of the invention.

The invention claimed is:
 1. A spectacle lens for a display device whichcan be placed on the head of a user and that generates an image, thespectacle lens comprising: a front side and a rear side; an inputsection; a deviating section separated from the input section; an exitsection in the rear side, and a light guide channel, wherein the lightguiding channel guides light beams from pixels of the image that isgenerated, wherein the light beams from the pixels are input into thespectacle lens through the input section and travel through thespectacle lens as far as the deviating section, wherein at the deviatingsection the light beams from the pixels are deviated in the direction ofthe exit section and are then output from the spectacle lens through theexit section, wherein the spectacle lens is configured as a progressivepower lens with a far-field region and a near-field region, wherein theexit section, as seen in a plan view of the rear side of the spectaclelens, lies outside the far-field region and outside the near-fieldregion, and wherein the exit section has a curvature that differs from acurvature of an intermediate region of the rear side between the exitsection and the near-field region in such a way that an ametropiacorrection when viewing an environment through the exit section isinferior than when viewing the environment through the intermediateregion.
 2. The spectacle lens as claimed in claim 1, wherein the rearside is entirely configured as a continuous and differentiable surface.3. The spectacle lens as claimed in claim 1, wherein the front side iscurved and the rear side is curved.
 4. The spectacle lens as claimed inclaim 1, wherein the rear side is a freeform surface that is configuredto correct ametropia of the user.
 5. The spectacle lens as claimed inclaim 4, wherein the exit section is spherically curved.
 6. Thespectacle lens as claimed in claim 4, wherein the exit section isaspherically curved.
 7. The spectacle lens as claimed in claim 1,wherein the exit section is spherically curved.
 8. The spectacle lens asclaimed in claim 1, wherein the exit section is aspherically curved. 9.The spectacle lens as claimed in claim 1, wherein the front side isspherically curved.
 10. The spectacle lens as claimed in claim 1,wherein an astigmatism in the exit section is more than 1 diopter ormore than 2 diopters.
 11. The spectacle lens as claimed in claim 1,wherein an astigmatism in the near-field region is not more than 1diopter or not more than 0.5 diopters.
 12. A display device, comprising:a holding device which can be placed on the head of a user; an imagegeneration module, which is fastened on the holding device; and imagingoptics, which are fastened on the holding device and which comprise aspectacle lens as claimed in claim 1, wherein the image that isgenerated is generated such that the user can perceive the image as avirtual image.
 13. A method for producing a spectacle lens, comprising:determining different ametropia ranges by a respective range ofaberrations to be corrected; calculating for each of the differentametropia ranges a curvature profile of the exit section; determiningthe ametropia range in which the aberration value lies for the spectaclelens to be produced; calculating the curvature profile of the rear sideof the spectacle lens to be produced by: selecting the exit sectioncorresponding to the ametropia range that was determined; and keepingconstant and not changing the curvature profile of the selected exitsection during the calculation of the curvature profile of the rearside; and producing the spectacle lens on the basis of the calculatedcurvature profile of the rear side.